251631120667 has 16 divisors (see below), whose sum is σ = 270668885760. Its totient is φ = 233228534112.

The previous prime is 251631120647. The next prime is 251631120677. The reversal of 251631120667 is 766021136152.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-251631120667 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (251631120647) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 612148 + ... + 937009.

It is an arithmetic number, because the mean of its divisors is an integer number (16916805360).

Almost surely, 2^251631120667 is an apocalyptic number.

251631120667 is a deficient number, since it is larger than the sum of its proper divisors (19037765093).

251631120667 is a wasteful number, since it uses less digits than its factorization.

251631120667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1549362.

The product of its (nonzero) digits is 90720, while the sum is 40.

The spelling of 251631120667 in words is "two hundred fifty-one billion, six hundred thirty-one million, one hundred twenty thousand, six hundred sixty-seven".